remove usages of deprecated pkg_resources module

https://gitlab.com/dbsystel/gitlab-ci-python-library/-/blob/ab03e1b6ad0ac118144516ed7e28ed928b918873/gcip/__init__.py#L58-63

.venv\Lib\site-packages\gcip\__init__.py:58: DeprecationWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html